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Electrical appliance for connection to an AC supply and a control method

a control method and electric appliance technology, applied in the direction of dc source parallel operation, sustainable buildings, energy industry, etc., can solve the problems of increased billed units of demand compared, significant costs, etc., and achieve the effect of increasing the power factor

Active Publication Date: 2022-06-14
SIGNIFY HLDG BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention relates to a system that uses an auxiliary supply to improve the power factor of a lighting system. This auxiliary supply is selected based on the power factor of the system to prevent low power factor or ensure high power factor. This results in a higher power factor and a lower energy cost. The system can switch between the main and auxiliary supplies based on the power factor to optimize energy usage. The overall energy cost is minimized by measuring the power factor and controlling the allocation of the two supplies. The invention provides a simple control scheme to select the power supply for the lighting element.

Problems solved by technology

Many utility companies charge commercial and industrial customers a penalty for having a poor power factor.
Therefore any drop in power factor below 1 results in additional billed units of demand compared to the actual useful power utilized.
For customers in areas where demand charges are high, extra units of billed demand can result in significant costs.

Method used

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  • Electrical appliance for connection to an AC supply and a control method
  • Electrical appliance for connection to an AC supply and a control method
  • Electrical appliance for connection to an AC supply and a control method

Examples

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Embodiment Construction

[0078]The invention will be described with reference to the Figures.

[0079]It should be understood that the detailed description and specific examples, while indicating exemplary embodiments of the apparatus, systems and methods, are intended for purposes of illustration only and are not intended to limit the scope of the invention. These and other features, aspects, and advantages of the apparatus, systems and methods of the present invention will become better understood from the following description, appended claims, and accompanying drawings. It should be understood that the Figures are merely schematic and are not drawn to scale. It should also be understood that the same reference numerals are used throughout the Figures to indicate the same or similar parts.

[0080]The invention provides an electrical appliance which is accessible to an AC supply as well as an auxiliary power supply. A power converter converts the AC power to supply a load. This power converter is usually a PFC...

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Abstract

An electrical luminaire receives an AC supply as well as an auxiliary power supply. A power converter converts the AC power to supply a lighting element. A power factor associated with the AC supply is used as a control input for selecting an amount of power to be supplied from the two supplies. This enables the overall power factor to be controlled, for example to avoid financial penalties associated with the use of the AC supply with low power factor.

Description

CROSS-REFERENCE TO PRIOR APPLICATIONS[0001]This application is the U.S. National Phase application under 35 U.S.C. § 371 of International Application No. PCT / EP2018 / 084567, filed on Dec. 12, 2018, which claims the benefits of European Patent Application No. 18156109.3, filed on Feb. 9, 2018 and Chinese Patent Application No. PCT / CN2018 / 070014, filed on Jan. 2, 2018. These applications are hereby incorporated by reference herein.FIELD OF THE INVENTION[0002]This invention relates to electrical appliances supplied by AC, and in particular relates to the issue of maintaining a high power factor.BACKGROUND OF THE INVENTION[0003]Many devices which are driven by an AC input, such as a mains input, are provided with a power converter, for AC to DC conversion.[0004]One function implemented within a power converter which is supplied with mains (or other AC) power is power factor correction (PFC). The power factor of an AC electrical power system is defined as the ratio of the real power flowi...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H05B45/355H05B45/20H05B45/10H05B45/3725H02M1/42H02M7/04
CPCH05B45/355H02M1/4208H02M7/04H05B45/10H05B45/20H05B45/3725H02M1/10H02J1/10H02J3/18H02J7/34Y02B40/00Y02P80/10H02M1/42
Inventor MAJI, GOUTAMWANG, ZHENGYU
Owner SIGNIFY HLDG BV